fix: use negfactor in negfactor scale test

[Saransh-cpp]

Description

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 86.38%. Comparing base (c7f7b27) to head (a5bfbf4).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #456 +/- ## ======================================= Coverage 86.38% 86.38% ======================================= Files 96 96 Lines 11139 11139 ======================================= Hits 9622 9622 Misses 1517 1517 ```

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